Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/payments/317` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys are required; payment is handled entirely through the X-PAYMENT header. The site advertises no rate limits and instant access.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint (`/payments/317`) actually returns or what input it expects beyond a POST body. The site's landing page lists many API paths but does not clarify whether `/api/v1/payments/317` maps to one of the listed services or is a distinct resource. Prospective users should be prepared to experiment or contact the provider for details.
Capabilities
Use cases
- —Programmatic access to premium API services without subscription or API key management
- —Agent-driven workflows that need on-demand, pay-as-you-go API calls settled in USDC on Base
- —Integrating low-cost per-request API access into Web3 applications
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing cheap micro-transactions for API calls ($0.02 each)
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Applications requiring high-throughput bulk access with predictable monthly billing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/317 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/payments/317 specifically does. The listing is effectively a stub with confirmed liveness and pricing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format for this endpoint
- —The purpose of /api/v1/payments/317 is unclear — it does not obviously map to any of the listed API categories on the landing page
- —No request or response examples available anywhere in crawled content
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge confirms live status with maxAmountRequired of 20000 base units of USDC (0.02 USD) on Basehttps://lowpaymentfee.com/api/v1/payments/317
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/payments/317
- —Site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com